@article{DAN_1977_232_5_a0,
     author = {A. V. Aizenshtat},
     title = {On singular integral equations on a countable set of closed curves, each enclosed within another},
     journal = {Doklady Akademii Nauk},
     pages = {985--988},
     year = {1977},
     volume = {232},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_232_5_a0/}
}